altin89 altin89

09-05-2021
Mathematics

contestada

What is a formula for the nth term of the given sequence?
20,50, 125...

Respuesta :

altavistard altavistard

09-05-2021

Answer:

a(n) = 20*2.5^(n - 1)

Step-by-step explanation:

Note that 50 is 2.5 times 20, and that 125 is 2.5 times 50. Thus the common factor is 2.5. The formula for the nth term is

a(n) = a(1)*r^(n - 1) => a(n) = 20*2.5^(n - 1)

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